Albert Barnes' Notes on the Whole Bible - 1 Samuel 13:20-21
The best rendering of the passage is perhaps as follows: “But all the Israelites went down to the Philistines to sharpen etc. 1 Samuel 13:21, whenever there was bluntness of edge to their shares and coulters and prong-forks and axes, and to point their goads.” Coulters and mattocks were cutting instruments of the type of the share. read more
The Pulpit Commentary - 1 Samuel 13:22
There was neither sword, etc. Armed only with clubs and their farming implements, it is no wonder that the people were afraid of fighting the Philistines, who, as we gather from the description of Goliath's armour, were clad in mail; nor is it surprising that they despised and neglected Saul and his few men, whom probably they regarded as an unarmed mob of rustics. The Ammonites probably were far less efficiently armed than the Philistines, who, as commanding the sea coast, could import... read more